I have never herd of T6, Iv herd of t5 t8 t10 t12. As long as they are high output and have a similar lumen to watt ratio then yes they should be about the same. The entire T and number is an old measurment of the thickness of the glass of the bulb the lower the number the thinner the glass. the thinner the glass the more effiencant. I would ask more about those t6 bulbs to find out the differnce. I am sure they are on par since they guys at the Hydro shop swear by them. I also got mine on the advice of the clerk
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